Asthma that occurs in the absence of or without clear evidence of an antigen-antibody reaction is called extrinsic asthma.

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Extrinisic asthma is actually asthma that is triggered by environmental factors such as pollen, pet dander or dust mites, which may not necessarily involve an antigen-antibody reaction. In contrast, intrinsic asthma is asthma that arises from factors such as stress, exercise, or respiratory infections.

Asthma That Occurs in the Absence of or Without Clear